Lock.



0. ROLAND.

LOOK.

APPLICATION FILED 11.13.12, 1911.

Patented July 11,1911.

@wxWW/p (9M0 nix/2W cogUMBIA PLANOGRAPH 615., WASHINGTON n c OTTOROLAND, OF HANOVER-LINDEN, GERMANY.

LOCK.

Specification of Letters Patent.

Application filed March 8, 1911.

Patented July 11, 1911.

Serial No. 613,016.

To all whom it may concern:

Be it known that I, OTTO ROLAND, a subject of the German Emperor,residing at HanovenLinden, in Germany, have invented a certain new anduseful Improvement in Locks, of which the following is a specification.

This invention relates to looks of the type wherein a key-operated bolt,that is to say a bolt adapted to be retracted by means of a key, isautomatically shot into locking position by a spring, when released froma restraining device by the movement imparted to a latch bolt by the actof closing the door.

The invention provides a lock wherein the said restraining device isunaffected by the inward movement of the latch-bolt, but is disengagedby the forward or outward move ment of said latch-bolt. This insuresthat the key-operated bolt is not released until it is properly in linewith the recess provided for it in the keeper.

The invention is illustrated in the annexed drawings, in which Figure 1is an elevation showing the interior of the lock, and Fig. 2 anelevation viewed at right angles to the plane of Fig. 1, showing thebolts in front view.

In the drawing a is the latch bolt retracting spindle, apertured forengagement with a handle or door-knob; b is the latch-bolt, to which thependent dog 0 is pivoted within the recess 0 The latter is somewhatwider than the dog and is out aslant, so that the dog can swing from theperpendicular toward the right of Fig. 1, but cannot swing toward theleft. The double armed lever (Z acted on by the spring d engages thenotch (Z in the retracted key-operated bolt 6, and thus prevents theshooting of the latter into locking position by the spring f. The recessh in the bolt 6 enables the latter to be locked in the retractedposition by the vertical bolt 9 of the small auxiliary lock 2'. Thekeeper is has spring-pressed plates serving as abutments for the boltsZ) and 6 when they are shot into locking position.

The action of the device is as follows. When on the closing of the doorthe latch bolt is thrust inward, z'. 6. toward the left of Fig. 1, thedog 0 yields and trips over the lever 03 without moving same. But whenthe latch bolt shoots forward into the recess in the keeper, the dog,unable to yield, actuates the lever cl and disengages same from the bolt6, whereupon the latter is shot into locking position by the spring f.

What I claim as my invention and desire to secure by Letters Patent ofthe United States is 1. In a lock the combination of a latch bolt, abolt adapted for retraction by a key, a spring operating to thrust saidkey-operated bolt into locking position, a restraining device whichautomatically engages the retracted key-operated bolt, and a deviceactuatable by the outward movement of the latch bolt for disabling saidrestraining device.

2. In a lock the combination of a latch bolt, a bolt adapted forretraction by a key, a spring operating to thrust said key-operated boltinto locking position, a springpressed restraining lever whichautomatically engages the retracted keyoperated bolt, and a dog pivotedto the latch bolt so as to have limited movement about its pivot, sothat said dog can trip over the restraining lever during inward movementof the latch bolt, but disengages said lever from the key operated boltduring outward movement of the latch bolt.

In witness whereof I have signed this specification in the presence oftwo witnesses.

OTTO ROLAND.

Witnesses:

MARTA L. THOMPSON, HERMINE FNAN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). G.

